truncus arteriosus

• right aortic arch (30-50%)
• VSD always immediately beneath common truncal valve
• "waterfall" or "hilar comma" sign (types II + III)

Collet & Edwards classification

I

short main PA arises from left post-lat aspect

II

PAs arise separately from left post-lat aspect

III

each PA arises from lateral aspects

IV

PAs arise from dorsal aorta ("pseudotruncus")

• probably tetralogy of Fallot with pulmonary atresia

© 2002, C.E. Kahn, Jr.
2002-04-18